2.
Separate egg yolks from whites; place whites in medium bowl and set aside. In large bowl beat butter with electric mixer until fluffy. Beat in sugar until combined. Beat in egg yolks, lemon peel, lemon juice, flour, and salt until just combined. Add milk; beat until just combined (mixture will be thin and will appear curdled).

4.
Loosely tent top of pie with foil to prevent overbrowning, making sure the foil does not touch the filling. Bake 10 minutes. Reduce heat to 350 degrees F. Bake for 20 to 25 minutes more or until set in the center.